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TextMarker!

Textmarker! is a text higlighter and text copying tool for Firefox. It allows you to highlight text selections via keyboard and context menu and then highlighted text to be copied. 3 highlighter colors can be configured.

Here is more about this add-on from the developers:

Allows you to highlight text selections via keyboard and context menu. Also allows for the highlighted text to be copied individually or all. 3 highlighter colors are available that can be customized.